>>35507354I'm using Photoshop to do it, but you can probably just as easily use GIMP. You can save transparent PNGs of your objects a lot of the time from a Google Image search, otherwise you can just save an image of it in a white void. Drag it into Photoshop and use the Magic Wand tool (with a tolerance of 20) to select all the white around your image, then hit "Delete" on your keyboard to remove it. If you do that, the object won't have anything around it and you can have those nice layered objects like in my images.
I can make a tutorial if anyone needs more help.